If I set some tag with exiftool e.g.
exiftool UserComment="test" video.mp4
I can then remove it with
exiftool UserComment= video.mp4
However, exiftool sets an additional tag ExifToolVersion
which I cannot delete with
exiftool -ExifToolVersion= video.mp4
because
Warning: Sorry, ExifToolVersion is not writable
How can I remove all traces of exiftool from the file? I need to keep other meta data tags untouched.